Dissolve polygons

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Q: How to dissolve vector polygons (or remove tile boundaries of adjacent maps)

A: Dissolving of areas is done with v.dissolve (v.extract -d). If tile boundaries of adjacent maps (e.g. CORINE Landcover SHAPE files) have to be removed, an extra step is required to first remove duplicated boundaries:

Remove duplicated tile boundaries: 

    v.clean clc2000_patched out=clc2000_clean tool=snap,break,rmdupl thresh=.01

Dissolve: 

    v.dissolve input=clc2000_clean output=clc2000_final
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